The humid subtropical monsoon climate of Nanjing is characterized by temperate weather; four distinct seasons, hot summer and cold winter; simultaneous advent of adequate precipitation, sunshine and heat. Subject to the influence of the Eurasian continental air mass, the weather in winter is sunny, cold and dry. In early summer with the impact of the frontal rain, Nanjing enters into the rainy season with remarkable increase in precipitation and the frequency of downpours and rainstorms. The height of summer follows with sunny weather and droughts. Spring and autumn mark the turn of winter and summer and are marked by dry and cool weathers. A frost-free period of about 225 days is good for crop growth. At times might occur floods, droughts, rainstorms, lingering rains, typhoons, high temperatures, strong convective weathers (including thunderstorms, squall lines, hails, etc.), cold waves, low temperatures, frosts, high winds, fogs and other disasters.

Pressure

monthly mean atmospheric pressure

Month

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Pressure(hPa)

10267

10245

10204

10145

10101

10054

10036

10055

10129

10195

10241

10270

Pressure (hPa)

10267

10245

10204

10145

10101

10054

10036

10055

10129

10195

10241

10270

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

fig.1 monthly mean pressure

Temperature

monthly mean temperature

Month

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Temp(oF)

36.3

39.5

47.6

59.3

68.9

75.9

82

81.5

73

62.7

50.7

40.1

Temp(oC)

2.4

4.2

8.7

15.2

20.5

24.4

27.8

27.5

22.8

17.1

10.4

4.5

Temperature (oC|oF)

2.4 oC 36.3 oF

4.2 oC 39.5 oF

8.7 oC 47.6 oF

15.2 oC 59.3 oF

20.5 oC 68.9 oF

24.4 oC 75.9 oF

27.8 oC 82 oF

27.5 oC 81.5 oF

22.8 oC 73 oF

17.1 oC 62.7 oF

10.4 oC 50.7 oF

4.5 oC 40.1 oF

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

fig.2 monthly mean temperature

monthly extreme mean temperature

Month

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Min Temp(oF)

30

33

40.6

51

60.6

69.2

76.2

75.5

66.5

55.2

42.9

32.7

Min Temp (oC)

-1.1

.6

4.8

10.6

15.9

20.7

24.6

24.2

19.2

12.9

6.1

.4

Max Temp (oF)

44.6

47.8

56.1

68.5

78

83.8

89.4

89

81.1

71.9

60.6

50

Max Temp(oC)

7

8.8

13.4

20.3

25.6

28.8

31.9

31.7

27.3

22.2

15.9

10

monthly extreme daily temperature

Month

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Min Temp(oF)

8.4

12.9

23

32

44.6

54.8

62.2

62.9

45.8

33

20.6

8.4

Min Temp (oC)

-13.1

-10.6

-5

0

7

12.7

16.8

17.2

7.7

.6

-6.3

-13.1

Max Temp (oF)

69.8

79.5

85.1

91.9

96.2

100.2

103.4

100.7

99.6

90.8

83.4

71.4

Max Temp (oC)

21

26.4

29.5

33.3

35.7

37.9

39.7

38.2

37.6

32.7

28.6

21.9

Humidity

monthly mean hunidity

Month

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Hunidity (%)

76

74

74

73

74

79

81

81

79

77

77

74

Hunidity (%)

76

74

74

73

74

79

81

81

79

77

77

74

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

fig.3 monthly mean hunidity

monthly minimum daily hunidity

Month

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Hunidity(%)

10

8

9

11

14

18

31

31

20

14

4

13

Precipitation

monthly mean precipitation

Month

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Precipitation(mm)

37.4

47.1

81.8

73.4

102.1

193.4

185.5

129.2

72.1

65.1

50.8

24.5

Days (Precipitation<0.1mm)

8.1

9.1

12.1

10.4

10.4

11.3

12.4

11.3

8.9

8.2

7.4

5.7

Days (Precipitation<10mm)

1.2

1.6

2.9

2.7

3

4.7

4.9

3.8

2.1

2.2

1.6

.7

Days (Precipitation<25mm)

0

.2

.7

.7

1.1

2.5

2.1

1.7

.8

.5

.5

.1

Days (Precipitation<50mm)

0

0

0

.1

.4

1

.9

.4

.2

.2

.1

0

Precipitation (mm)

37.4

47.1

81.8

73.4

102.1

193.4

185.5

129.2

72.1

65.1

50.8

24.5

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

fig.4 monthly mean precipitation

monthly maximum daily precipitation

Month

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Precipitation(mm)

32.7

32.2

87

51.8

140.5

172.5

179.3

140.5

61.9

78.8

54.7

30.5

Wind

monthly mean wind speed

Month

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Wind Speed(m/s)

2.4

2.7

2.9

2.8

2.6

2.6

2.5

2.6

2.3

2.2

2.2

2.2

Wind Speed (m/s)

2.4

2.7

2.9

2.8

2.6

2.6

2.5

2.6

2.3

2.2

2.2

2.2

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

fig.5 monthly mean wind speed

monthly maximum daily
wind speed and direction

Month

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Wind Speed (m/s)

15

14.7

15.8

21

15.7

25

16

18.5

18.7

15

14.1

13

Sunshine

monthly mean sunshine duration

Month

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Duration (hour)

129.1

123.3

136.1

168.1

194

171.9

205.6

214.7

167.2

169.1

153.5

150.2

Duration (hour)

129.1

123.3

136.1

168.1

194

171.9

205.6

214.7

167.2

169.1

153.5

150.2

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

fig.5 monthly mean sunshine duration

monthly sunshine percentage

Month

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Percentage (%)

41

40

37

44

46

41

47

52

45

48

49

48

Remarks:
Weather forecast is provided by China Meteorological Administration.
Climate information is based on monthly averages for 30-year period of 1971-2000.
Precipitation includes both rain and snow.